每天第一个到机房的人要把门打开，最后一个离开的人要把门关好。现有一堆杂乱的机房签 到、签离记录，请根据记录找出当天开门和关门的人。 -The people want the first day to the engine room door open, people want the last one to leave the door closed. Existing pile of messy room sign, signed away from the record, accord